American Thoracic Society Documents 401 Figure 2. Algorithm forinitiating empiric antibi-otic therapy for hospital-acquired pneumonia (HAP),ventilator-associated pneu-monia (VAP), and health-care-associatedpneumonia(HCAP). Figure 2.
One milligram is one thousandth of a gram and one thousand micrograms. A milligram is generally abbreviated as mg. MICROGRAM. One microgram is one millionth of a gram and one thousandth of a milligram. It is usually abbreviated as mcg or ug. Mcg and ug are the same.
Definition of a Mcg. The metric system uses the abbreviation mcg to represent micrograms. A microgram is equivalent to a millionth of a gram or a thousandth of a milligram. In the International System of Units measurements, the mcg is one of the smallest frequently used units. To convert milligrams to micrograms, multiply 1,000 by the mass.